OCTOBER TERM, 1975 Per Curiam 424 U. S. decisions as Cox v. Louisiana, supra; Adderley v. Florida, 385 U. S. 39 (1966); and Kovacs v. Cooper, 336 U. S. 77 (1949). Those cases stand for the proposition that the government may adopt reasonable time, place, and manner regulations, which do not discriminate among speakers or ideas, in order to further an important governmental interest unrelated to the restriction of communication. See Erznoznik v. City of Jacksonville, 422 U. S. 205, 209 (1975). In contrast to O'Brien, where the method of expression was held to be subject to prohibition, Cox, Adderley, and Kovacs involved place or manner restrictions on legitimate modes of expression-picketing, parading, demonstrating, and using a soundtruck. The critical difference between this case and those time, place, and manner cases is that the present Act's contribution and expenditure limitations impose direct quantity restrictions on political communication and association by persons, groups, candidates, and political parties in addition to any reasonable time, place, and manner regulations otherwise imposed."7 17 The nongovernmental appellees argue that just as the decibels emitted by a sound truck can be regulated consistently with the First Amendment, Kovacs v. Cooper, 336 U. S.77 (1949), the Act may restrict the volume of dollars in political campaigns without impermissibly restricting freedom of speech. See Freund, Commentary in A. Rosenthal, Federal Regulation of Campaign Finance: Some Constitutional Questions 72 (1971). This comparison underscores a fundamental misconception. The decibel restriction upheld in Kovacs limited the manner of operating a soundtruck, but not the extent of its proper use. By contrast, the Act's dollar ceilings restrict the extent of the reasonable use of virtually every means of communicating information. As the Kovacs Court emphasized, the nuisance ordinance only barred soundtrucks from broadcasting "in a loud and raucous manner on the streets," 336 U. S., at 89, and imposed "no restriction upon the communication of ideas or discussion of issues by the human voice, by newspapers, by pamphlets, by dodgers," or by soundtrucks operating at a reasonable volume. Ibid. See Saia v. New York, 334 U. S.558, 561-562 (1948).

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